softest
sof-test
adjective
Having the greatest degree of softness, gentleness, or pliability.
"This cashmere jumper is the softest I own."
Thesaurus
Synonyms: untoughened, delicate, tender, soft, light, gentle, easy, mild, piano, pianissimo assai, pianissimo, diffused
Antonyms: concentrated, forte, hard, hardened, loud, surd, unvoiced, voiceless